Tape cast MoSi{sub 2}/{beta}{prime}-SiAlON composite reinforced with SiC monofilaments

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:530703

Huang, C M; Ho, W T.Y.; Yuh, C Y ^[1]

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1. Energy Research Corp., Danbury, CT (United States); and others

A composite of MoSi{sub 2}/{beta}{prime}-SiAlON (Si{sub 3}Al{sub 3}O{sub 3}N{sub 5}) reinforced with SiC monofilaments (AVCO SCS-6) was fabricated using a tape casting technique. The composite was hot-pressed at a temperature of 1600{degrees}C for 2 h under a pressure of 34 MPa in a N{sub 2} environment. The fiber reinforced composite exhibited significant improvement in work of fracture (WOF) as well as in ultimate strength, in comparison to the MoSi{sub 2}/{beta}{prime}-SiAlON composite. Ultimate flexure strength values measured using four-point bending were 690 {+-} 127 MPa and 490 {+-} 31 MPa for the materials with and without fiber reinforcement, respectively. A work of fracture of 23.6 kJ m{sup {minus}2} was obtained for composite with fiber reinforcement, compared to 1.9 kJ m{sup {minus}2} for the composite without fiber reinforcement. Filament push-out tests revealed a moderate interfacial bonding strength of 46 MPa and a frictional sliding stress of 40 MPa. SEM observation of fractured specimens showed that the enhanced WOF was attributed to a significant amount of fiber pull-out during fracture.

• OSTI ID: 530703
• Report Number(s): CONF-9604124--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM NITRIDES
CASTING
FIBERS
FRACTURE PROPERTIES
HOT PRESSING
MOLYBDENUM SILICIDES
REINFORCED MATERIALS
SILICON CARBIDES
SILICON NITRIDES
ULTIMATE STRENGTH